Is it not crazy what the computers can teach us? Taking on b3, instead of a3! I still can only find it when using multi PV. Maybe it is Zugzwang. Not sure though. So how does Houdini avoid Zugzwang? Strelka is just Houdini here without the obfuscated output so that doesn't count, sorry Yuri. Unless you can prove it is doing things really different. Houdini's eval is too low apparently that is what Strelka shows us. But, how to avoid the Zugzwang! In multi PV it was found quickly, here is 23 plies deep the first thirteen moves:

Build 89 now, and it is not wrong but I can't just do the first thirteen moves in Multi PV all the time That is way too costly... What is the magic trick that Houdini is using here As I said to Jimmy, I feel we are so close to some breakthrough and yet it eludes us...

Happy to say, that I now have at least found a way to solve the position, without the above method resorting to Multi PV of thirteen moves . The basic problem is with the nullmove searches which are very selective for Rainbow Serpent, with more futility pruning allowed near the root than in Stockfish; Stockfish can have futility pruning in the last 7 plies, Rainbow Serpent in the last 24 plies, with basically the same sort of rule, this involves a risk. When these nullwindow searches are getting too long and they still have not found the right sequence, and they always overlook some things especially if it involves multiple pieces temporarily left en prise, but there is the chance they won't find it ever anymore. I had to go back to a less selective mechanism for this and the solution time is not very competetive with Zappa on a fast rig, but without it the nullwindow search would not find this even after ten hours or so... That is not very close to being usable. Part of that is changed by taking, in retrospect, the Rebel approach actually, where some of the older Rebels actually had a fixed number of plies without much selectivity before becoming very selective in the last plies near the horizon. This approach makes any results at bullet chess/testing tank I suppose, but that is not my main concern right now, engine is not meant for playing Blitz. It must be possible to do some optimizing but if you don't find the requested move even after hours of searching then my method of optimizing is a bit helpless

i told 'im tempted' because im runing 4 games here,and more games at LSS,and all the games just with a old dual core...if i start mre chess games,i wont be able to play a good chess,that is why im 'tempted',but i think is more reasonable to wait until i finish some of my games